The Dark Angels stand first amongst the Space Marine Chapters, as they have done since their very inception as the Ist Legion. They are a proud Chapter, with traditions and rituals that date back to the earliest days of the Imperium of Man. The origins of the Dark Angels Chapter remain shrouded in mystery. Few Imperial records of its beginnings still exist, nor are there many mentions of the part it played in the Emperor's Great Crusade during the early 31st Millennium. Most references in the histories of the Imperium to its deeds during the accursed times of the Horus Heresy have actually been expunged. Yet a legend persists that at one point the Dark Angels teetered on the very brink of heresy and that an act of the most terrible betrayal dishonoured all of the Ist Legion's feats of valour, leaving an enduring stain upon all of its Successor Chapters' honour. Such is their shame that from that time onwards, the Dark Angels and their Unforgiven Successors strive for absolution from the sins of millennia past.